Heating furnace



May 19, 1925.

G. H. .(sLEY HEATING FURNACE Filed March 1 1922 2 Sheets-Sheet 1 .1711; enier May 19, 1925. 1,538,116

- ,G. H. ISLEY HEATING FURNACE Filed March l, 1922 2 Sheets-Sheet 2 Patented May 19, 1 925.

, UNITED STATES I I -1,538,116 PATENT OFFICE.

GEORGE H. ISLCEY, OF WORCESTER, MASSACHUSETTS, A SSIGNOR T MORGAN CON- STRUC'TION COMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

. Application filed March 1,1922. Serial No. 540,217.

, togethere with the accompanying drawings,

is a specification.

The present invention relates to heating furnaces of the regenerative type, whereinthe air employed'to support the combustion of gaseous or other fuel is subjected to a preliminary heating in advance of its admission to the furnace chamber.

The present invention contemplates farreaching improve'mentsin the way or manner of handling and heating such air, in the adaptation of the air regenerator principle to a billet heating furnace; the improvements reside especially in a novel and sime plified arrangement of the regenerator as-' sages 1n which the air is heated,and furt er, in the means employed to obtain a reversal.

of the air and combustion products throu h said passages. The essential features oft e invention are fully set forth in the following description, reference being had to the accompanying drawings, in which section, of a billet heating furnace to which the invention is shown applied.

Fig. 2 is a longitudinal sectional view of the furnace.

3| Fig. 3 is an enlarged detail sectional View, on line 33, Fig. 1, of the reversing devices employed, in connection with the several passages for air and combustion products.

Fig. 4 is an enlarged detail sectional View,

40 on line 44-, Fig. 1, showing the construction employed at the point where the air is admitted. v

. Like reference characters refer to like parts in the different figures.

Referring to Figs. 1 and 2, the invention is shown applied toga heating furnace'of well known type, which, for example, may be employed for the reheating of billets-0r the like, the latter, as shown; being conveyed to the furnace longitudinally by conveyor rolls 1, 1. The billets are successively in? troduced broadside into the furnace through an opening '2 at one end of the same,. by

' means of pusher devices 3 of the way to the stack. "regenerators necessitates disposal of the reversing instrumentalities for the air and Fig l is a plan View, partly in horizontal construction. Said billets are gradually moved, in a row, toward the'delivery or hot end of the furnace, discharging by gravity upon a suitable incline 4: through al in the manner common in apparatus of this class. The admixture of gas, or other fuel,

with air, and the resulting combustion of same, takes place'in the furnace chamber at this delivery end, the products of combustion being withdrawn lengthwise of the furthence discharged to the stack.

, In all previous constructions, the preheating of the air for admixture with the gas or other fuel which enters by way ,of passage 7 has been accomplished by drawing or forcing said air through regenerator passages running'lengthwise of the-furnace,one or the other of said passages having previously been heated by the travel therethrough of nace chamber toward the receiving end and delivery opening 5 onto conveyor rolls 6, 6,

the issuing combustion products, on their 5 Such an arrangement of combustion products at one end of the furnace, well beyond the billet discharging and conveying devices and, consequently, obstructing free access to'the' latter and requiring a space for the furnace and its a purtenan'ces of much. greater lengththan would be occupiedin the absence of these r'egenerator passages. In addition, this arrangement of regenerators below and-running lengthwise of th furnace, precludes all possibility of accesswo the underside of the furnace chamber for the removal of scale and slag that accumulates therein,

According to the present invention, the

difficulties enumerated are overcome by an arrangement'of regenerator passages-and reversing instrumentalitieswhich does not increase in any way the overall length of the furnace equipment and which permits free access both to the discharge end of the furnace and to the bottom thereof. As shown in Figs. 1 and 2, the'air is admitted to the furnace from above, near thedischarge end of the latter and adjacent to the fuel admission passage 7, substantially the same as in previous constructions, by means of a conduit or main :8. But the air-1s supplied a),

this main 8 by a pipe9 which leads from a point along one side of the furnace, rather 'erator 15 and connects .than from beyond rected vertical branches the usual checker-work same, and one or the end thereof. The pipe 9, as shown. in Fig. 1, communicates with an underground flueor passage 10 having, as shown in Fig. 3, two upwardly dicommunication with a regenerator pas-- sae'16'. I

hese vregenerator passages and-16, of

construction, exten transversely of the" furnace beneath the the other of them serves forthe conveyance of combustion products from the furnace to a stack passage 17 'loafter passing over the billets,

' terminals, 11, 12,

a and 14 is disposed the cated on the opposite side of the furnace from the passages 11, 12, 13 and-.14. The

other of said regenerators 1 5 o r"'16-serv es for the conveyance of airwhlch s forced in in any suitable way, as by a blower 18. As shown'in Fig. 4, he blower passage 191s equipped with the usual butterfly valve 20, which, in one position,

generator 16 and connects the regenerator 1'5 to-the stack passage 17, and which. in the other'position, directs air into the regenthe regenerator 1 6 with the stack passage 1 1 Between the terminals ,of the passages 13 terminal of another passage 21, the latter connecting, by means of a 1111622, with the downwardly directed passage 23 at. the end of the furnace, through which the waste products of combustion,

are with- In connection with the several flue 1.3, 14 and 21 is provided a reversing device consisting of a pair of shiftable hoods 24, 25, the same having depending skirts 26, 26 which'are adapted to make a seal with'the body of water that is contained in a baseor pan 27' in surrounddrawn.

'ingrelation to each of the five flue term'i rials 11', 12, 1s, 14. and 21. Each hood 24.,

25 is adapted to'establishiwater sealed communication betweentwo of said terminals, the hood 24 serving to connect'the terminal 13 either with the terminalll or terminal 21, and the hood 25 servingrto connect the ter- 'minal 14 either with the terminal 12 or the terminal .21,depend1ng upon-the positions assumed by said hoods.

strained tomove iirunison, through a parallel motion, by, means of pivoted links 28,

28. The'right hand pos tion'of' said hoods is shown in Fig. 1; the'other or left hand position is shownlin Fig. 3.-

The terminal of'each passage or flue 11, 12 is provided with a swinging cover.29, the latter being pivoted to thebase 27 at 30 and serving, hen in lowered position,

11 and 12, termi directsair into re-- g the Said hoods are conto close andseal its respective terminal. Each cover 29 has a projection or ear 31 adapted to be engaged by the apron or skirt 26 of the adjacent hood structure as shown in Fig. 3, procures the opening of the cover, and the coiisequent communica- Such engagement,

tion of its associated flue with the adjacent flue through the medium of the hood. When the hood structure is moved away from operagive relation to the cover equipped flue, sa1 end of its flue. a v

. In the right han positionof the hood structure, as shownin Fig. 1, and with the valve 20 pccupying' the position shown in Fig. 4, the air: for combustion, blower 18 through passage 19,.is conducted by way of regenerator passage 16'and enters beneath hood 25 byway of flue terminal '14. Theh'ood 25, in'its right hand position, covers and seals the 12, .at the same time holding open the cover 29 of the latter terminal. As a consequence of this, the entering air, heated by its travel throu' h' the regenerator passage 16, flows downwardly through the flue 12 into underround fine 10, the left hand branch 11 of which is closed by the left hand cover 29.

Hence said heated airis conveyed by pipe 9 to the conduit -8, entering the furnace. adjacent to the fuel passage? at theend thereof directs the combustion products through the regenerator passage 15, the latter, in Fig. 4, being connected to the stack passa e17.

OTBVQISG the flow of generator passage 16 has been cooled down,

hood structure is thrown over. to the positionshown in Fig. '3 and, at the same time, .the valve 20 is moved into the dotted line position of Fig.'4.- Under these conditions, the air forced in by blower 18 travels ator pa age 15, and thence, by way of flue 13, hoo '24 and flue'll into the underground flue 10,-it beingunderstood that the' left,

hand cover 29.0f flue terminal 11 is held open by hood 24, forthis purpose. ,.Under these conditions, the right hand cover 29 being of pipe. 9 and conduit 8. to the furnace.

of passage 23 ator' passage and flue-14, and after travelling through said regenerator'passage, in order to reheat the same, leavethe furnace by wayof stack passage 17. 1 j

Fromthe foregoing,- itfis'fplear that the cover closes bygravity andseals the air after the reso forced in by terminals 14 and v left hand hood 24. The latter connects'the flue terminals 21 and "13 'an'dhence as shown through the highly heated rgenerclosed, the heated air travels by way I s The products of combustion leaving byway and flue 22 enter the regener- 16- by way offlflue. 21, hood 25 I class described, of-means for passage therethrough of com apparatus provides for heating the air, used to support the combustion of fuel in the furnace, in a highly efficient manner, the re-' versal of said air being effected in such a way that no handicapis placed on the construction of the furnace from the standpoint of introducing and delivering the, metal of slag and scale from the bottom of the furnace,the openings 32, 32 in the furnace bottom communicating with apit 33, which affords ample spacefor such removal.

I claim,

1. The combination, with a heating furnace having uni-directional flow of combustion products therethrough, ofmeans extending transversely thereof for regeneratively heating the air. used to support oom bastion of fuel in said furnace.

2. The combination, with a furnace of the.

procuring the ustion prod note in one direction only from end to end, and regenerator passages for the air supplied to said furnace', extending beneath the same from side to side.

3. The combination with a regenerative heating furnace, means for procuring the passage therethrough of combustion products in one direction only from end to end,

- said means comprising regenerator passages and reversing devices disposed inwardly of the ends of said furnace, whereby to give free access to said ends for the admission and-removal of the material to-be heated.

4:. In a regenerative heating furnace having uni-directional flow of combustion products the-rethrough, an opening at one end for the admission of the material to be heated and anopening at the opposite end ,for'the delivery of said material, in combination with regenerator passages and reversing in' strumentalities therefor disposed wholly between said openings.

5. The combination, with a furnace of the class described, of transverse air regenerator passages and reversing instrumentalities therefor, the latter being Wholly removed from the ends of said furnace, whereby to give free access to said ends for. the admission and removal of material.

6. The combination, with a heating furnace having uni-directional flow of combustion products therethrou h, of transverse regenerator passages for t e airsupplied to said furnace, and for the products of comthe direction of the currents therethrough.

7. The combination, with a heating furnace, extending transversely beneath the same, and means forreversing the passage of air and combustion products through said passages, said reversing means being disposed on opposite sides of saidafurnace, whereby to give free access to the ends of the furnace chamber andthe-ends of said passages. i;

' 8. The combination, with a heating fur-- nace having uni-directional flow of combustion products therethrough, with an openat one end for the admission ofmaterial to be heated, and: an opening in its bot- '9. The combination, with a furnace of the class described, of a pair of transverse re generator passages alternately rendered available forthe admission of air, a Waste gas flue .from the furnace having its terminal intermediate the terminals of said regenerator passages, and reversing means, operable at said terminals, for connecting said waste gas flue to one. or the other of said regenerator passages, and at the same time connecting the other regenerator passage to the air intake of the furnace.

10. The combination, with a furnace of the class described, of a pair of transverse regenerator passages alternately rendered" availablevfor the admission of air, a waste, gas flue from the furnace having its termi-' nal intermediate the terminals of said regenerator passages, an air intake to the fur- Z nace having branches cotermin'ous with said passages and flue, and reversing means operable at said termlnals for connecting said waste gas flue to one or the other of said.re-'

generator passages, and at the same timef connecting the other regenerator passage to one of said branches.

'11. The combination, with afurnace ofthe class described, of a pair of transverse regenerator passages alternately rendered available for the admission of air, an air intake to the furnace li'aving branches coterminous with said passages, and revers alternately thewaste gas flue from the furnace.

12. The combination, with a furnace of the class-described, of a pair of regenerator passages alternately rendered available for the admission of air, an air intake to the fur-- nace having branches coterjminouswith said passages, a gravity acting closure for each branch, and reversing I means operable at? said closures, in connecting a 'regen'erator said terminals to .open oneon the other OFtidn, a reversing means 'on one side 9f the furnace for sald c0mbust1 0n products, and

passage term-inal'to its adjacent air branch a secend reversing means on the opposite 10 terminal. side of the furnace for the entering air.

' 13. The combination, with .a furnace of Dated this 23rd day of February, 1922.

the class described, of transverse regenery ators for the air and products of combusx GEORGE H. ISLEY. 

